I need help on Trench Warfare plzzz

A: Was a form of military conflict in which opposing sides fought one and other from trenches facing one and other. a dead lock where neither side can progress. Communication trenches enabled men to pass food and equipment which passed between the lines without being exposed to enemy fire.
B: During Trench Warfare, men dug tunnels underneath enemy positions (such as trenches) and then use explosives to destroy the enemy's defenses from underneath. ... Once located, a small explosive would be placed and detonated.
C: Many soldiers living in the trenches suffered from Trench Foot. Rain and bad weather would flood the trenches making them boggy, muddy, and could even block weapons and make it hard to move in battle.